Even in a real life majority of high class prostitutes are used to claiming that current client (YOU) are the special exception. They say they don't do certain things with other clients. You know, typical things like "
I dont kiss other patrons, I only kiss you. You are my favorite.", blah blah, etc. etc.
(Cough cough. I am totally not talking from my own experience, ehm, I based this completely on rumours and a hearsay. )
It is just a little white lie. It makes men feel special and thus they give bigger tips to girls. Everybody is happy.
But if it floats your boat, then you are free to believe that was her first time working in brothel, she will never work in brothel again and she was complete virgin before she met you.